Aruncus dioicus GOAT'S BEARD

Aruncus dioicus (Formerly A. sylvester)
GOAT'S BEARD

4-6 ft. (Zone 4)  Stately, shrub-like perennial that produces creamy-white plumes of blossoms in early summer.  Forms large yet non-invasive clumps in rich soil. Also known as Giant Astilbe.
 
Photo Credit: www.waltersgardens.com